Regular Expressions 101

^start of line

https:the literal text https: (case sensitive)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Non-Capturing Group(?:www\.)?

?repeats the group contents below at most once:

wwwthe literal text www (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

youtubethe literal text youtube (case sensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

comthe literal text com (case sensitive)

\ban ASCII word boundary

Global pattern flags

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

^https:\/\/(?:www\.)?youtube\.com\b

New

https://www.youtube.com/watch?v=AAAAAAAAAAA
https://www.youtube.comm/watch?v=AAAAAAAAAA
https://youtube.com/watch?v=AAAAAAAAAAA
https://youtube.comm/watch?v=AAAAAAAAAAA

youtube.com/watch?v=AAAAAAAAAAA
www.youtube.com/watch?v=AAAAAAAAAAA
https://example.com/redirect?url=https://www.youtube.com/watch?v=AAAAAAAAAAA